LIBKML: add support for writing atom:author (ATC 30)

git-svn-id: https://svn.osgeo.org/gdal/trunk@26966 f0d54148-0727-0410-94bb-9a71ac55c965
Ili: Add layers for surface and area geometries

git-svn-id: https://svn.osgeo.org/gdal/trunk@26967 f0d54148-0727-0410-94bb-9a71ac55c965
Merge branch 'trunk' into trunk_travis_macosx